Rust and McFarlin

Henry Jackson Rust married Mary "Polly" McFarlin or McFarland in Jennings County, Indiana on March 17, 1840.There were many Rusts living in the county during the 40's thru the 60's, possibly longer.I'm not sure when the McFarlins came to the county, but I would like to know the names of Mary McFarlin's parents.Supposedly she was born in Pulaski County, Kentucky. Any information of these two families would really be appreciated.thanks. Bud Caudle